//
//  UIColor+YZAdd.m
//  app
//
//  Created by 王宇宙 on 2017/12/25.
//  Copyright © 2017年 Facebook. All rights reserved.
//

#import "UIColor+YZAdd.h"

@implementation UIColor (YZAdd)

+ (UIColor *)colorWithHexString:(NSString *)hexStr {
  
  NSString *cString = [[hexStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
  
  // String should be 6 or 8 characters
  if ([cString length] < 6) {
    return [UIColor clearColor];
  }
  // 判断前缀
  if ([cString hasPrefix:@"0X"])
    cString = [cString substringFromIndex:2];
  if ([cString hasPrefix:@"#"])
    cString = [cString substringFromIndex:1];
  if ([cString length] != 6)
    return [UIColor clearColor];
  // 从六位数值中找到RGB对应的位数并转换
  NSRange range;
  range.location = 0;
  range.length = 2;
  //R、G、B
  NSString *rString = [cString substringWithRange:range];
  range.location = 2;
  NSString *gString = [cString substringWithRange:range];
  range.location = 4;
  NSString *bString = [cString substringWithRange:range];
  // Scan values
  unsigned int r, g, b;
  [[NSScanner scannerWithString:rString] scanHexInt:&r];
  [[NSScanner scannerWithString:gString] scanHexInt:&g];
  [[NSScanner scannerWithString:bString] scanHexInt:&b];
  
  return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];
}

@end
